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代码编辑器：

if ($_SERVER["REQUEST_METHOD"] == "POST") {
   if (empty($_POST["name"])) {
     $nameErr = "姓名是必填的";
   } else {
     $name = test_input($_POST["name"]);
   }
   
   if (empty($_POST["email"])) {
     $emailErr = "电邮是必填的";
   } else {
     $email = test_input($_POST["email"]);
   }
     
   if (empty($_POST["website"])) {
     $website = "";
   } else {
     $website = test_input($_POST["website"]);
   }

if (empty($_POST["comment"])) {
     $comment = "";
   } else {
     $comment = test_input($_POST["comment"]);
   }

if (empty($_POST["gender"])) {
     $genderErr = "性别是必选的";
   } else {
     $gender = test_input($_POST["gender"]);
   }
}

function test_input($data) {
   $data = trim($data);
   $data = stripslashes($data);
   $data = htmlspecialchars($data);
   return $data;
}
?>

<h2>PHP 验证实例</h2>
<p><span class="error">* 必需的字段</span></p>
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>"> 
   姓名：<input type="text" name="name">
   <span class="error">*<?php echo $nameErr;?></span>
   <br><br>
   电邮：<input type="text" name="email">
   <span class="error">*<?php echo $emailErr;?></span>
   <br><br>
   网址：<input type="text" name="website">
   <span class="error"><?php echo $websiteErr;?></span>
   <br><br>
   评论：<textarea name="comment" rows="5" cols="40"></textarea>
   <br><br>
   性别：
   <input type="radio" name="gender" value="female">女性
   <input type="radio" name="gender" value="male">男性
   <span class="error">*<?php echo $genderErr;?></span>
   <br><br>
   <input type="submit" name="submit" value="提交"> 
</form>

<?php
echo "<h2>您的输入：</h2>";
echo $name;
echo "<br>";
echo $email;
echo "<br>";
echo $website;
echo "<br>";
echo $comment;
echo "<br>";
echo $gender;
?>

代码编辑器：

运行结果：